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1d
revised Proving that $S^c=\left\{f(x)\in C^2[0,1]\;\Big\vert\; \int_{0}^{1}f(x)dx > 3\right\}$ is open in $C^2[0,1]$ with a specific metric
removing (completeness) tag
1d
revised Completeness of ${C^2[0,1]}$ with under a specific metric
removing (completeness) tag; edited tags
1d
comment A possible complete metric on the set of twice-differentiable functions on $[0,1]$
Note that the (completeness) tag was deemed to have no real value. See the meta discussion here.
1d
revised A possible complete metric on the set of twice-differentiable functions on $[0,1]$
completeness tag not liked: http://meta.math.stackexchange.com/q/21031/8348
1d
revised Using the Pumping Lemma to show that $\{a^nb^{n^2} : n\in \mathbb{N} \}$ is not a context-free language
added 23 characters in body; edited tags; edited title
2d
revised Solving the trigonometric equation $\tan^2x+\cot^2x=2-\cos^{2014}(2x)$
incorporated OP's "answer" (which is really part of the question)
Jul
28
comment Counting problem of combinations of symmetric matrix.
Also, some motivation for this may be in order. Is this just an interesting something that you thought of? Do you have some application in mind?
Jul
28
comment Counting problem of combinations of symmetric matrix.
I'm not sure this is as completely described as you think. What do you mean by "$G$ is partitioned in to two sub matrices based on the adjacency of $n$ th column/row". How do you determine which cols/rows are adjacent to the $n$th col/row? Note, too, that if $H=PG$ where $P$ is a permutation matrix, then $H$ is obtained by just permuting the rows of $G$, so may not be symmetric itself. Does this matter? After partitioning $G$ do you permute something?
Jul
28
revised Picking (and replacing) among five balls in an urn
formatting
Jul
28
revised How many three digits even numbers can we form such that if one of digit is $5$ the following digit must be $ 7$?
Editing out a previous incorrect attempt. Formatting.
Jul
28
comment How many three digits even numbers can we form such that if one of digit is $5$ the following digit must be $ 7$?
10 choices for the first digit? Really?
Jul
28
revised Presentation of the symmetric group of 5 symbols.
added 22 characters in body; edited tags; edited title
Jul
28
revised Trig to determine distance: boat on course parallel to shore.
MathJaxified
Jul
27
comment Is $1992! - 1$ prime?
In addition to @quid's advice, perhaps you could add the title and author(s) of the book, and the location in the book (page number) where it is found.
Jul
27
revised Different formulas for matrix transformations
deleted 14 characters in body; edited title
Jul
27
revised Equivalence of two different versions of “change of basis matrix”?
deleted 37 characters in body; edited title
Jul
27
revised Why is $\{1+2x-x^2,4-2x+x^2,-1+18x-9x^2\}$ not a basis on $\Bbb P_2(\Bbb R)$?
mainly, removing the (basis) tag; see meta http://meta.math.stackexchange.com/q/21091; removed additional question asked after answers were posted
Jul
27
revised Proving that a basis of an $n$-dimensional linear space must have $n$ linearly independent vectors
slight improvement over Martin's edit
Jul
27
revised How do the rows of a change of basis matrix form a basis for expressing columns?
mainly, removing the (basis) tag; see meta http://meta.math.stackexchange.com/q/21091; also included a longer quote from the article
Jul
27
revised Possible definition of the matrix representation of a linear transformation with respect to given bases
mainly, removing the (basis) tag; see meta http://meta.math.stackexchange.com/q/21091